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Scanning electron microscope images of centrifugally spun rPET fibers prepared from various polymer solution concentrations: (a) 5; (b) 6; (c) 7; (d) 8; (e) 9; (f) 10; (g) 11; (h) 12; and (i) 13 wt %. Centrifugal spinning condition: rotational speed, 15,000 rpm; needle inner diameter, 160 μm; collection distance, 10 cm.
